Not necessarily!
Really there no need for a faster input relay or a faster output relay.
That is all false logic.
I matters NOT which relay closes or opens first... AS LONG AS the RF is
not sent from the radio BEFORE the relays are closed and ready to take RF.
AND the RF STOPS flowing before the relay DE-energise. That's ALL that
is needed.
73
Jim W7RY
On 12/7/2018 9:16 PM, Bob Maser wrote:
I must be old school. The input relays need to be slower than the
output relay.
Seems to me that a RJ-1 takes 8ms to close and stop bouncing around. I
have always
used a P&B miniature open frame DPDT for that purpose. The output of
the amp needs
to be closed before the input turns on.
Bob
On Fri, Dec 7, 2018 at 9:39 PM Jim <jimw7ry@gmail.com
<mailto:jimw7ry@gmail.com>> wrote:
Those relays that Rich (and I ) used are mostly unavailable. I
used to
buy them 100s at a time. No more of them can be had.
Most of what you find on eBay are seconds and most don't work. Or
they
are re-labeled counterfeits.
Thanks
73
Jim W7RY
On 12/4/2018 4:03 PM, Alek Petkovic wrote:
> G'day Vic.
>
> The Matsushita/Panasonic relay that Rich Measures used in his QSK
> circuit, published at somis.org <http://somis.org>, is still
available on Ebay. I bought
> 10 of them a couple of years ago
>
> Otherwise, Jim, W7RY, uses a small relay in his QSK kit. He laso
deals
> on Ebay.
>
> 73, Alek.
> VK6APK
>
> On 4/12/2018 6:21 PM, Victor Rosenthal 4X6GP wrote:
>> I'm trying to choose a relay to use as the input relay in a QSK
amp.
>> I have been very satisfied with the Jennings RJ1-A as an output
>> relay. The input relay in this circuit needs to be DPDT, or I'd
just
>> use two similar vacuum relays.
>>
>> Here are my needs:
>>
>> 1. DPDT.
>> 2. 12 or 24v coil.
>> 3. Operate/release time, including bounce <= 4 ms. Faster is
better.
>> 4. Should carry 100w RF in 50 ohm system. Not expected to
make/break
>> live circuit.
>> 5. Must have low resistance for low-level signals (receive path).
>> 6. Must have long life >= (10 x 10**6 operations)
>> 7. Must not be insanely expensive, and available from Mouser or RS.
>>
>> I found this relay:
>>
<https://www.mouser.co.il/datasheet/2/418/NG_SS_108-98005_L-1019204.pdf>
>> But maybe there's a better choice? I'm overwhelmed by the
number and
>> varieties of relays in the catalog.
>
_______________________________________________
Amps mailing list
Amps@contesting.com <mailto:Amps@contesting.com>
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|